C.I. Mahadevan 5 Adi 4 Inch: Cochin Hanifa plays the title role of CI Mahadevan, who goes to a village where a bomb blast in a school bus has created terror in the hearts of the villagers. He is being assisted by a bunch of policemen working in the local police station. These policemen are more concerned about their personal matters than the problems faced by the public. How Mahadevan unravels the mystery behind the blast with the help of these policemen is the crux of the story.